Does Ravenbloom Tome's effect get consumed/wasted if used on a non-damaging spell?

Ruling: Yes, the Ravenbloom Tome effect is consumed even if used on a spell that doesn't deal damage. The effect applies to "the next spell" you play, regardless of whether that spell can deal damage.

Nuances:

• Non-damaging spells cannot deal bonus damage, but they still consume the Tome's effect
• You should pair the Tome with damaging spells to get value from the effect
• Multiple Tomes stack (two Tomes = two extra damage on the next spell)